Using the Biopac System for
and Hand-Grip Force Measurements
Setting up the
Biopac System | Collecting
Data | Analyzing
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These instructions are not complete as they
assume the user can follow on-screen instructions. As this program has many
available options that are not presented here, you are encouraged to experiment
with the different options and analyses possible.
Setting up the Biopac System to Measure EMG
and Hand-Grip Force
on the Biopac icon on either the toolbar at the top or the icon on the
a electrode lead cable and hand dynamometer into the MP30 box. Attach the
red and black leads to the electrodes on the muscle and attach the white
lead to the ground electrode.
the MP30 pulldown menu, select Setup Channels. The channels
that the electrode lead cable and dynamometer are plugged into should be
indicated by the three checkmarks to the right of the channel numbers.
on Presets next to the channel used by the electrode leads and
select EMG (30-500 Hz).
on Presets next to the channel used by the hand dynamometer and
select Hand Dynamometer (Kg). Close the menu box (clicking on the X
in upper right corner).
the MP30 pulldown menu, select Setup Acquisition.
on the pulldown menu for Acquisition Length and choose a length of
time long enough to complete the data collection (e.g. 200 sec).
everyone and everything is ready, click on the Start button in the
lower right corner. To stop data acquisition, click on the Stop button
located in the same spot. Should the test need to be restarted, stop the
data acquisition and restart by clicking on the Start button.
However, whenever restarting data collection, you will be prompted to
respond as to whether you want to overwrite the existing data; select Yes.
Analyzing the Data
the Measurement bar located just above the tracings, you will see four or
five measurement options showing options such as Time, delta T.
You will need these two options, but click on the one of the other
Measurement boxes to pull-down the Measurement box menu and select area.
This option will measure the area (in mV-sec) above and below the baseline
of the EMG spikes.
on the "I" bar located in the lower right corner.
the cursor to the beginning of the EMG activity that you want to begin to
analyze. Notice that the Time measurement box indicates the time of
data selected. Press/hold the left-hand mouse button and drag to the end
of the EMG activity that you want to analyze. As you drag, watch the delta
T which indicates the length of time that you are highlighting. Record
the EMG area. Be sure that the delta Ts are all equal when
comparing EMG areas.
collapse the data so that it will fit on a single screen, under Display
pulldown menu, select Autoscale Horizontal.